most of Paul's Epistles begin with the word Saints and this is translated holy ones in the Greek, the moment we are born again our spirit has been regenerated recreated by the Holy Spirit, we have the very same nature that Jesus was born with at His incarnation, but if there's any issues with continual sin or habitual sin such as sending Saints or Saints that sin, that would be found in the unsaved soul according to James 1:21 and the unrenewed mind according to Ephesians 4:22-24, for starters.